<template>
  <view class="search-box">
    <!-- 使用 uni-ui 提供的搜索组件 -->
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <view class="sugg-list" v-if="searchResults.length">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in showHistorys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  import {
    thru
  } from 'lodash'
  // import debouce from 'lodash/debounce'
  function debouce(fn, delay) {
    let timer = null
    return function(e) {
      clearTimeout(timer)
      timer = setTimeout(() => {
        fn.call(this, e)
        // console.log(e);
      }, delay)
    }
  }
  export default {
    data() {
      return {
        searchResults: [],
        historyList: ['a', 'app', 'apple']
      };
    },
    computed: {
      showHistorys() {
        return [...this.historyList].reverse()
      }
    },
    created() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      input: debouce(function(e) {
        // console.log(this);
        // console.log(e);
        this.kw = e
        this.getSearchList()
      }, 500),
      // 清空搜索历史记录
      cleanHistory() {
        // 清空 data 中保存的搜索历史
        this.historyList = []
        // 清空本地存储中记录的搜索历史
        uni.setStorageSync('kw', '[]')
      },
      // 点击跳转到商品列表页面
      gotoGoodsList(kw) {
        uni.navigateTo({
          url: '/subpkg/good_List/good_List?query=' + kw
        })
      },
      async getSearchList() {
        // 判断关键词是否为空
        if (this.kw === '') {
          this.searchResults = []
          return
        }
        // 发起请求，获取搜索建议列表
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveHistoryList()
      },
      saveHistoryList() {
        this.historyList.forEach((item, index) => {
          if (item === this.kw) {
            console.log(this.kw);
            this.historyList.splice(index, 1)
          }
        })
        this.historyList.push(this.kw)
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      gotoDetail(goods_id) {
        uni.navigateTo({
          // 指定详情页面的 URL 地址，并传递 goods_id 参数
          url: '/subpkg/good_detail/good_detail?goods_id=' + goods_id
        })
      }
    }
  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .history-box {
    padding: 0 5px;

    .history-title {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 40px;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }

    .history-list {
      display: flex;
      flex-wrap: wrap;

      .uni-tag {
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }

  .sugg-list {
    padding: 0 5px;

    .sugg-item {
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      align-items: center;
      justify-content: space-between;

      .goods-name {
        // 文字不允许换行（单行文本）
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用 ... 代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
</style>